Should I Test Different Lid and Packaging Combinations to Determine Which Best Preserves the Intended Fragrance During Storage?

Why test combinations instead of guessing

Most makers settle their packaging by eye: a nice lid, a nice box, perhaps tissue inside. Then a batch smells weaker after a few months and nobody knows which layer failed — or whether any layer could have helped. A combination test replaces opinion with a result you can use for years.

As general practice, the biggest single step is usually the lid. An open candle releases fragrance into the room continuously; a closed one releases it into a small headspace that soon stops taking more. Cartons, bags and sleeves can add a little more protection, can absorb some fragrance themselves, and mainly protect against dust, light and knocks. How much each layer matters for your oil, wax and holding time is exactly what the test tells you.

Design: one jar, five arrangements

The most common design error is comparing a lidded apothecary jar with an unlidded tumbler and calling it a lid test. The jars differ in diameter, wall, headspace and glass as well as the lid, so you cannot tell what caused the difference. Keep the jar the same and change only the closure and packaging.

The salsa jar with its 63 mm lug cap suits this well: it is cheap, it closes firmly, and every candle in the test sits in identical glass. If you sell in another jar, run the same design in that jar — what matters is that all five arrangements share it.

Pour from one oil lot, one wax lot and one session. Weigh each candle so they start the same. Code the bases, not the lids, because lids come off during scoring.

Check the lid fit before you start

A closure test is only as good as the closures. Before pouring, check each lid or cap on an empty jar: does it sit level, does it turn to the same tightness, is there any gap at the rim? A lug cap that is cross-threaded, or a press lid that sits slightly proud, will behave like a loose cover and blur your results. Reject any jar or lid with chips or cracks — cracked glass is removed from candle production as a general safety rule.

Tighten every lid the same way at packing, and write that down as part of the method. If one packer screws caps hand-tight and another barely turns them, your production stock will not match your test, however good the test was.

Running the test and scoring it

Store all arrangements together in the place your stock actually lives — your warehouse shelf or stockroom, not a cooler office. Check at points matched to your holding time: a suggested start is day 30, day 90 and day 180.

Put a price on each layer

Now cost the arrangements. CSI does not sell cartons, bags, sleeves or labels, so use your own packaging prices. CSI's jar prices are listed: Clear Glass Jar with Golden Lid (150 g) ₹944.00 ÷ 10 = ₹94.40 each; matte 200 ml jar ₹708.00 ÷ 10 = ₹70.80 each, with no lid listed; Salsa Glass Jar with lug cap ₹200.60 ÷ 5 = ₹40.12 each in packs of 5 and ₹1,475.00 ÷ 50 = ₹29.50 each in packs of 50.

For the test itself, using 150 g candles at 8% load (138 g wax + 12 g oil): 15 scented candles need 15 × 12 = 180 g of oil. British Rose in two 100 g packs: 2 × ₹342.20 = ₹684.40. Twenty salsa jars as four packs of 5: 4 × ₹200.60 = ₹802.40, which is less cash than one 50-pack at ₹1,475.00 even though each jar costs more. Wax for 18 candles is about 2.7 kg of CSI 464: 3 × ₹507.40 = ₹1,522.20. Test materials: ₹684.40 + ₹802.40 + ₹1,522.20 = ₹3,009.00, before your own cartons and bags.

Then read the results against cost. If arrangement B (cap only) scores as well as D (cap, bag and carton) at your holding time, the bag adds cost without adding fragrance; keep it only if you need it for transit or damp. If D clearly beats B, the bag is earning its price.

Changing jar after the test

If the test shows a lid matters and your current jar has none, switching jar is a product change, not just a packaging one. A different jar changes diameter and fill, so re-test the wick, and confirm fill weight by a real pour. The 150 g golden-lid jar states a fill of 150 g and hot pour up to 85°C; check your pour temperature against that before using it.

Transit and damp are separate questions

This test is about fragrance during storage. Cartons and bags also protect against breakage, dust, light and monsoon damp, and those are real reasons to use them even if the fragrance scores are identical. Decide the packaging in two steps: first, the cheapest arrangement that holds the fragrance; second, whatever extra your shipping and climate require. Keep the reasons separate in your notes so nobody later removes a bag that was there for damp, or keeps a carton that was there for nothing.

If you sell gift sets with tissue or loose wraps around unlidded jars, arrangement E is the one to watch. Loose covers look generous but protect very little, and tissue can take up fragrance.

Choosing your arrangement

Choose the cheapest arrangement whose scores stay within your own acceptable range for your full holding time. Write it into your packaging specification so everyone packs the same way. Repeat the test whenever you change oil, jar, carton supplier or holding time.

Repeat the comparison for each fragrance family you sell. A closure that holds a woody oil comfortably may not be enough for a bright citrus, whose page already warns that its top notes fade faster than warmer families.

Remember what the test cannot do. It compares options; it does not give the oil a shelf life. CSI's oil listings state no shelf life and no storage temperature. Ask us on WhatsApp (+91 7397976926) for the IFRA certificate, MSDS and storage guidance for your oil and lot, in writing. The 60-month shelf life on CSI 464 and CSI 468 is a wax statement, and no closure turns it into a fragrance promise.

And keep the customer advice simple and honest: lid on between burns, cool, out of direct sun. Do not tell them the scent will never change; tell them how to look after it.

Where this page fits

CSI already has guides that cover parts of this question. This page answers one fragrance-ageing decision; these cover the neighbouring questions:

Three things to buy for this decision

Frequently asked questions